1273928197 has 4 divisors (see below), whose sum is σ = 1285834176. Its totient is φ = 1262022220.

The previous prime is 1273928147. The next prime is 1273928219. The reversal of 1273928197 is 7918293721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1273928197 - 2¹¹ = 1273926149 is a prime.

It is a super-2 number, since 2×1273928197² = 3245786102223341618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1273928197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273928147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5952829 + ... + 5953042.

It is an arithmetic number, because the mean of its divisors is an integer number (321458544).

Almost surely, 2^1273928197 is an apocalyptic number.

It is an amenable number.

1273928197 is a deficient number, since it is larger than the sum of its proper divisors (11905979).

1273928197 is a wasteful number, since it uses less digits than its factorization.

1273928197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11905978.

The product of its digits is 381024, while the sum is 49.

The square root of 1273928197 is about 35692.1307433445. The cubic root of 1273928197 is about 1084.0475113978.

It can be divided in two parts, 127 and 3928197, that added together give a square (3928324 = 1982²).

The spelling of 1273928197 in words is "one billion, two hundred seventy-three million, nine hundred twenty-eight thousand, one hundred ninety-seven".